Threshold Pharma (THLD) Says Evofosfamide Studies Did Not Meet Primary Endpoints

December 7, 2015 6:18 AM EST
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Threshold Pharmaceuticals, Inc. (NASDAQ: THLD) today announced the outcomes of two Phase 3 cancer studies (MAESTRO and TH-CR-406/SARC021) of evofosfamide (previously known as TH-302), an investigational hypoxia-activated prodrug, which is being evaluated for first-line treatment of advanced pancreatic adenocarcinoma and advanced soft tissue sarcoma, in combination with chemotherapy. The Phase 3 studies are being conducted under Threshold's collaboration with Merck KGaA, Darmstadt, Germany.

In the Phase 3 MAESTRO study, patients with previously untreated, locally advanced unresectable or metastatic pancreatic adenocarcinoma treated with evofosfamide in combination with gemcitabine did not demonstrate a statistically significant improvement in overall survival (OS) compared with gemcitabine plus placebo (hazard ratio [HR]: 0.84; 95% confidence interval [CI]: 0.71 - 1.01; p=0.0589).

In the Phase 3 TH-CR-406/SARC021 study being conducted in collaboration with the Sarcoma Alliance for Research through Collaboration (SARC), patients with locally advanced unresectable or metastatic soft tissue sarcoma treated with evofosfamide in combination with doxorubicin did not demonstrate a statistically significant improvement in OS compared with doxorubicin alone (HR: 1.06; 95% CI: 0.88 - 1.29).

Patient safety was monitored in MAESTRO and TH-CR-406/SARC021 by independent data monitoring committees throughout the conduct of each study. No new clinically significant safety findings were observed.

Detailed results from both studies will be submitted for presentation at upcoming international scientific meetings and for publication in peer-reviewed journals. Threshold will not be pursing further development of evofosfamide in soft tissue sarcoma and pancreatic cancer.

"We are surprised and disappointed that these studies did not show that evofosfamide could extend the lives of patients with these two difficult-to-treat diseases," said Barry Selick, Ph.D., Chief Executive Officer at Threshold. "Threshold has been pursuing evofosfamide for over ten years in collaboration with world-class scientists and investigators throughout the world. While we believe there remains substantial data to support the role of hypoxia in cancer treatment resistance, we are deeply frustrated with our inability in these trials to impact that in a meaningful way. I would like to thank all of the patients and their families, and the physicians, nurses, and support staff who participated in these studies."

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